Name: Ensifer kostiensis (Nick et al. 1999) Young 2003

Category: Species

Proposed as: comb. nov.

Basonym: Sinorhizobium kostiense Nick et al. 1999

Etymology: kos.ti.en’sis. N.L. masc. adj. kostiensis, pertaining to Kosti, the region in Sudan where most of these organisms have been isolated

Pronunciation (Latin), gender: EN-si-fer kos-ti-EN-sis, masculine

Type strain: ATCC BAA-227; DSM 13372; HAMBI 1489; LMG 15613; LMG 19227; NBRC 100382; TTR 15

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: Z78203 Analyse FASTA

Valid publication: Young JM. The genus name Ensifer Casida 1982 takes priority over Sinorhizobium Chen et al. 1988, and Sinorhizobium morelense Wang et al. 2002 is a later synonym of Ensifer adhaerens Casida 1982. Is the combination "Sinorhizobium adhaerens" (Casida 1982) Willems et al. 2003 legitimate? Request for an Opinion. Int J Syst Evol Microbiol 2003; 53:2107-2110. 🇳🇿

IJSEM list: Euzeby JP. Notification list. Notification that new names and new combinations have appeared in volume 53, part 6 of the IJSEM. Int J Syst Evol Microbiol 2004; 54:309-311.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

Risk group: 1

• Synonyms:

  • Name	Kind
    Sinorhizobium kostiense Nick et al. 1999	homotypic synonym, validly published under the ICNP

• Notes:
  • 😷 The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 1, note = "Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No". — The risk group for Swiss Confederation has been imported on 2024-02-01. The full classification is: risk group = 1. — The risk group for Germany has been imported on 2026-08-13. The full classification is: risk group = 1. — If in doubt, use the risk group given in the regulations for your country and, if these are not available, use the risk group given in the catalogue of the culture collection from which you have obtained or intend to obtain the strain.
  • 🎓 Name mentioned 2 times in PubMed until 2026-06-11.

Parent taxon: Ensifer Casida 1982

Assigned by: Young JM. The genus name Ensifer Casida 1982 takes priority over Sinorhizobium Chen et al. 1988, and Sinorhizobium morelense Wang et al. 2002 is a later synonym of Ensifer adhaerens Casida 1982. Is the combination "Sinorhizobium adhaerens" (Casida 1982) Willems et al. 2003 legitimate? Request for an Opinion. Int J Syst Evol Microbiol 2003; 53:2107-2110. 🇳🇿

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Record number: 775922